Read counts per sample and genes to explore the quality of libraries
Violin plot indicates similar expression across samples but many genes need to be filtered due to low count values.
Most samples express similar number of genes with at least 5 reads mapped to the gene.
Most sample have similar library size and it does not seem to relate with the sampling year. There is however more variation on Day 1.
Variation in sequencing depth can potentially introduce error to the model even if it is corrected for in the models. Consistent sample prep and equal amount of RNA maybe helpful in keeping it somewhat similar.
Read count distribution colored by day of sample prep